192 TRANSACTIONS OF THE [MAY 18, 
ance of being a matted mass of hair. One mass of thirty pounds 
was entirely of this character. A fifteen-pound mass contained 
a dozen or more crystals of rutile forty-five cm. in length and 
from one-half to two mm. in diameter. Magnificent crystals of 
amethyst have also been found, one of which is entirely of gem- 
cutting material and weighs 550 pennyweights or 274 ounces 
troy. Topaz, blue and white, is found in the same localities. 
J. F. Kemp, 
Secretary. 
FAUNAS OF THE PARADOXIDES BEDS IN EASTERN 
NORTH AMERICA, NO. 1. 
By G. F. MattrHew. 
CONTENTS. 
PAGE. 
Introd metiomy i: 20. cccied ssw adawemeasiavedee dacece ssbseceuses eoesece veacdae conctndodeemees 192 
Mirmuber Crustaceans ie. s.tcsco ccc. se csccs ce acaseeseet a= ssc ras-ion en cccnstenss neem 194 
GENUS sACTIOSHUS NG dis SPECLES!s2:. saeceseseasereratece s<eakgss c/a ntece meee 207 
Genus Microdiscusimndits SPeCles:--....cccesiencs-sccthasesesacessscneaenetaeee ame 236 
The following article is a contribution to a revision of the 
faunas of the Paradoxides beds as they are developed in 
eastern North America. The region where these beds are 
found is spread along the Atlantic sea-board from New Found- 
land to eastern Massachusetts, and it is not known that the 
genus Paradoxides existed west of the Braintree basin in that 
State. 
In this article only the smaller crustaceans, including two 
genera of trilobites, are treated off. But these small fossils are 
as valuable for the correlation of horizons as the larger species, 
for they were as sensitive to a change of conditions as those, 
and tell the story of the subzone which they mark with 
as great certainty as Paradoxides itself. In fact, they are even 
of higher value for this purpose, as a small piece of shale will 
contain a fully characterized example. 
In the author’s former paper * an outline was given of the 
Cambrian system in eastern North America and its faunas, so 
that it seems unnecessary here to do more than call attention to 
the sub-divisions of the Paradoxides sub-faunas as they are 
developed in this region. We know of the occurrence here of 
*The Protolenus Fauna. New York Acad. Sci., Vol. XIV., p. 101. 
